Table 1: Differences between groups of APC knee replacements.

Group 1 (nonconstrained APC)Group 2 (constrained APC)

Number50 patients36 patients
Diagnostic ( )Revision, osteoarticular allograft (20)
Revision, knee prosthesis (6)
Osteogenic sarcoma (8)
Chondrosarcoma (7)
Leiomyosarcoma (2)
Fibrosarcoma (2)
Giant cell tumor (2)
Desmoplastic fibroma (1)
Traumatic bone loss (2)
Revision, tumor endoprosthesis (14)
Osteogenic sarcoma (11)
Revision, osteoarticular allograft (3)
Chondrosarcoma (3)
Lymphoma (2)
Soft tissue sarcoma (1)
Malignant fibrohistiocytoma (1)
Giant cell tumor (1)
Followup69 months (range, 8–141 months)75 months (range, 7–197 months)
Age35 years old (range, 15–80)35 years old (range, 8–84)
Sex22 females; 28 males18 females; 18 males
Location ( )Distal femur (28)
Proximal tibia (22)
Distal femur (17)
Proximal tibia (19)